body {
    margin: 0;
    background-image:url('/image/background_image.jpg');
    background-size: cover;
}

#logo_container {
    background-color: white;
    border-radius: 10%;
    box-shadow: 0 0 2% rgba(0,0,0,0.5);
    width: 50%;
    height: 15%;
    margin: 1% 25% 5% 25%;
    position: absolute;
}

#logo {
    width: 100%;
    height: 100%;
}

#main_container {
    background-color: white;
    border-radius: 5%;
    box-shadow: 0 0 2% rgba(0,0,0,0.5);
    width: 45%;
    height: 40%;
    margin: 15% 25% 10% 25%;
    position: absolute;
    padding: 2%;
}

#admin_text {
    width: 50%;
    height: 10%;
    margin: 1% 25% 5% 30%;
    font-family: sans-serif;
    font-size: 140%;
}

#upload_file_container {
    width: 50%;
    height: 10%;
    margin: 1% 25% 5% 30%;
}

#choose_file_text {
    width: 50%;
    height: 10%;
    margin: 0% 25% 5% 28%;
    font-family: sans-serif;
    font-size: 110%;
}

#input_file {
    width: 50%;
    height: 10%;
    margin: 0% 30% 5% 20%;
}

#upload_button {
    width: 30%;
    height: 6%;
    font-size: 100%;
    text-align: center;
    border-radius: 5%;
    margin: 1% 35% 5% 25%;
}

#send_button {
    width: 40%;
    height: 6%;
    font-size: 100%;
    text-align: center;
    border-radius: 5%;
    margin: 5% 25% 5% 30%;
}